Method for joining components

Abstract

A method for joining at least two components by inductive high-frequency pressure welding is disclosed. The first component has a first material structure with a first hardness and the second component has a second material structure with a second hardness which is smaller than the first hardness. Both components are inductively heated in the region of the joining surfaces and are subsequently pressed together by a compressive force. The joining surface of the first component with the first hardness, which is greater than the second hardness of the second component, is pre-contoured in a spherical, conical or convex manner prior to joining the two components.

The invention claimed is: 
     
       1. A method for joining components by inductive high-frequency pressure welding, comprising the steps of:
 pre-contouring a joining surface of a cast component in a spherical, conical, or convex manner, wherein a distal-most portion of the spherical, conical, or convex joining surface is located at a center of the joining surface; 
 pre-contouring a joining surface of a forged component in a flat manner; 
 inductively heating the cast component in a region of the joining surface of the cast component and the forged component in a region of the joining surface of the forged component, wherein the cast component has a first material structure with a first hardness and wherein the forged component has a second material structure with a second hardness which is smaller than the first hardness; 
 pressing the components together after the step of inductively heating by a compressive force; and 
 displacing a melted material from a joining region of the components by the pre-contoured joining surface of the cast component via the pressing. 
 
     
     
       2. The method according to  claim 1  wherein the cast component has a monocrystalline material structure. 
     
     
       3. The method according to  claim 1  wherein the cast component has a directionally solidified material structure. 
     
     
       4. The method according to  claim 1  wherein the cast component and the forged component are respectively made of a nickel-based material. 
     
     
       5. The method according to  claim 1  wherein both of the components are inductively heated in the regions of the joining surfaces before and during the step of pressing. 
     
     
       6. The method according to  claim 1  wherein the cast component is a rotor blade of a gas turbine rotor and wherein the forged component is a rotor base body of the gas turbine rotor. 
     
     
       7. The method according to  claim 1  wherein the forged component is a rotor blade of a gas turbine rotor and wherein the cast component is a rotor base body of the gas turbine rotor.